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Myelinated and Unmyelinated Fibres

In a myelinat...

Question

In a myelinated neuron, the voltage gated channels are present in the allowing rapid transmission of action potentials.

A

axon terminals

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B

nodes of Ranvier

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C

cell body

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D

synaptic cleft

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Solution

The correct option is B nodes of Ranvier
In a myelinated neuron the voltage gated channel are present in the nodes of nodes of Ranvier. At these nodes, myeline sheaths are absent. This allows the rapid transmission of action potentials across the length of axons.

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Similar questions

Which one of the following is the correct sequence of events that follows in a synaptic transmission of nerve impulse?

1. The presynaptic membrane is depolarized.

2. Voltage gated calcium channels open

3. Release of synaptic Vesicles

4. Calcium enters the synaptic knob

5. The neurotransmitter diffuses across the synaptic cleft and binds to the receptor proteins on the postsynaptic membrane.

Q. Read the following statements:
(i) Saltatory type of present in non-myelinated nerve fibres (axons) only
(ii) The nerve impulse generated at a point in the neuron faes resistances at sites where myelin sheath is present
(iii) Nodes of Ranvier of axon is exposed to ECF
(iv) In myelinated neurons, ion channels and transport pumps are absent in the nodes of Ranvier
(v) In myelinated nerve fibre, the nerve impulse travel as a continous wave of depolarisation
How many of the statements are correct?

Q. A list of events occurring in the transmission of nerve impulse across the synapse is given below in a random order.
(i) Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post-synaptic neuron.
(ii) Neurotransmitter binds to the receptor on post synaptic membrane.
(iii) Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter release into synaptic cleft.
(iv) Depolarisation of pre-synaptic membrane.
(v) Arrival of action potential at axon terminal.
Which of the following options represents these events in a correct order?

Q. In unmyelinated neurons, voltage gated channels are present at regular intervals to ensure that is regenerated at regular intervals.

Q. If the 'Inactivation gates of sodum' are closed and 'potassium voltage gated channels' are open, in what phase is what phase is the 'action potential' in your body?

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